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diff --git a/boost/beast/http/impl/fields.ipp b/boost/beast/http/impl/fields.ipp
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+++ b/boost/beast/http/impl/fields.ipp
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+//
+// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// Official repository: https://github.com/boostorg/beast
+//
+
+#ifndef BOOST_BEAST_HTTP_IMPL_FIELDS_IPP
+#define BOOST_BEAST_HTTP_IMPL_FIELDS_IPP
+
+#include <boost/beast/http/fields.hpp>
+
+namespace boost {
+namespace beast {
+namespace http {
+namespace detail {
+
+// `basic_fields` assumes that `std::size_t` is larger than `uint16_t`, so we
+// verify it explicitly here, so that users that use split compilation don't
+// need to pay the (fairly small) price for this sanity check
+BOOST_STATIC_ASSERT((std::numeric_limits<std::size_t>::max)() >=
+    (std::numeric_limits<std::uint32_t>::max)());
+
+// Filter a token list
+//
+inline
+void
+filter_token_list(
+    beast::detail::temporary_buffer& s,
+    string_view value,
+    iequals_predicate const& pred)
+{
+    token_list te{value};
+    auto it = te.begin();
+    auto last = te.end();
+    if(it == last)
+        return;
+    while(pred(*it))
+        if(++it == last)
+            return;
+    s.append(*it);
+    while(++it != last)
+    {
+        if(! pred(*it))
+        {
+            s.append(", ", *it);
+        }
+    }
+}
+
+void
+filter_token_list_last(
+    beast::detail::temporary_buffer& s,
+    string_view value,
+    iequals_predicate const& pred)
+{
+    token_list te{value};
+    if(te.begin() != te.end())
+    {
+        auto it = te.begin();
+        auto next = std::next(it);
+        if(next == te.end())
+        {
+            if(! pred(*it))
+                s.append(*it);
+            return;
+        }
+        s.append(*it);
+        for(;;)
+        {
+            it = next;
+            next = std::next(it);
+            if(next == te.end())
+            {
+                if(! pred(*it))
+                {
+                    s.append(", ", *it);
+                }
+                return;
+            }
+            s.append(", ", *it);
+        }
+    }
+}
+
+void
+keep_alive_impl(
+    beast::detail::temporary_buffer& s, string_view value,
+    unsigned version, bool keep_alive)
+{
+    if(version < 11)
+    {
+        if(keep_alive)
+        {
+            // remove close
+            filter_token_list(s, value, iequals_predicate{"close", {}});
+            // add keep-alive
+            if(s.empty())
+                s.append("keep-alive");
+            else if(! token_list{value}.exists("keep-alive"))
+                s.append(", keep-alive");
+        }
+        else
+        {
+            // remove close and keep-alive
+            filter_token_list(s, value,
+                iequals_predicate{"close", "keep-alive"});
+        }
+    }
+    else
+    {
+        if(keep_alive)
+        {
+            // remove close and keep-alive
+            filter_token_list(s, value,
+                iequals_predicate{"close", "keep-alive"});
+        }
+        else
+        {
+            // remove keep-alive
+            filter_token_list(s, value, iequals_predicate{"keep-alive", {}});
+            // add close
+            if(s.empty())
+                s.append("close");
+            else if(! token_list{value}.exists("close"))
+                s.append(", close");
+        }
+    }
+}
+
+} // detail
+} // http
+} // beast
+} // boost
+
+#endif // BOOST_BEAST_HTTP_IMPL_FIELDS_IPP